硫酸作氧化剂时，根据其浓度不同以及反应条件不同，得到的还原产物有所不同： 1. **浓硫酸作氧化剂时**： - 当与金属铜反应时（加热条件下），浓硫酸被还原为二氧化硫。化学方程式为\(Cu + 2H_{2}SO_{4}(浓)\stackrel{\triangle}{=\!=\!=}CuSO_{4}+SO_{2}\uparrow+ 2H_{2}O\)。 - 在一些有机反应中，如苯的磺化反应，浓硫酸作磺化剂（也体现了浓硫酸一定的氧化性），生成苯磺酸，反应中硫的化合价不变，主要体现的是硫酸的酸性和磺化性，但也从侧面反映了浓硫酸在不同反应中的不同角色，化学方程式为\(C_{6}H_{6}+H_{2}SO_{4}\stackrel{\triangle}{=\!=\!=}C_{6}H_{5}SO_{3}H + H_{2}O\)。 2. **稀硫酸作氧化剂时**：当稀硫酸与活泼金属（如锌）反应时，稀硫酸被还原为氢气，化学方程式为\(Zn + H_{2}SO_{4}(稀)=\!=\!=ZnSO_{4}+H_{2}\uparrow\)。 <a href="/?from=ask_words" style="color:red" target="_blank">点击前往免费阅读更多精彩小说</a>

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